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  Subjects -> CHEMISTRY (Total: 846 journals)
    - ANALYTICAL CHEMISTRY (48 journals)
    - CHEMISTRY (599 journals)
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ANALYTICAL CHEMISTRY (48 journals)

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Accounts of Chemical Research     Full-text available via subscription   (Followers: 95)
Acta Analytica     Hybrid Journal   (Followers: 7)
Advances in Analytical Chemistry     Open Access   (Followers: 27)
American Journal of Analytical Chemistry     Open Access   (Followers: 31)
Analytica Chimica Acta     Hybrid Journal   (Followers: 40)
Analytical and Bioanalytical Chemistry     Hybrid Journal   (Followers: 32)
Analytical Chemistry     Full-text available via subscription   (Followers: 247)
Analytical Chemistry Insights     Open Access   (Followers: 22)
Analytical Chemistry Research     Open Access   (Followers: 7)
Analytical Letters     Hybrid Journal   (Followers: 11)
Analytical Spectroscopy Library     Full-text available via subscription   (Followers: 10)
Annual Review of Analytical Chemistry     Full-text available via subscription   (Followers: 9)
Biomonitoring     Open Access   (Followers: 2)
Chinese Journal of Analytical Chemistry     Full-text available via subscription   (Followers: 3)
Combinatorial Chemistry - an Online Journal     Open Access   (Followers: 2)
Comprehensive Analytical Chemistry     Full-text available via subscription   (Followers: 5)
Critical Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 26)
Current Analytical Chemistry     Hybrid Journal   (Followers: 7)
Drug Testing and Analysis     Hybrid Journal   (Followers: 6)
Electroanalysis     Hybrid Journal   (Followers: 6)
Field Analytical Chemistry and Technology     Hybrid Journal   (Followers: 4)
Handbook of Analytical Separations     Full-text available via subscription   (Followers: 1)
Handbook of Thermal Analysis and Calorimetry     Full-text available via subscription   (Followers: 1)
International Journal of Analytical Chemistry     Open Access   (Followers: 21)
International Journal of Chemical and Analytical Science     Full-text available via subscription   (Followers: 3)
International Journal of Environmental Analytical Chemistry     Hybrid Journal   (Followers: 6)
International Journal of Polymer Analysis and Characterization     Hybrid Journal   (Followers: 7)
Journal of Analytical & Bioanalytical Techniques     Open Access   (Followers: 6)
Journal of Analytical Atomic Spectrometry     Full-text available via subscription   (Followers: 10)
Journal of Analytical Chemistry     Hybrid Journal   (Followers: 21)
Journal of Combinatorial Chemistry     Full-text available via subscription  
Journal of Electroanalytical Chemistry     Hybrid Journal   (Followers: 5)
Journal of Essential Oil Research     Hybrid Journal   (Followers: 2)
Journal of Radioanalytical and Nuclear Chemistry     Hybrid Journal   (Followers: 5)
Journal of Thermal Analysis and Calorimetry     Hybrid Journal   (Followers: 23)
Main Group Metal Chemistry     Hybrid Journal   (Followers: 1)
Microchemical Journal     Hybrid Journal   (Followers: 3)
Nigerian Journal of Chemical Research     Full-text available via subscription  
Phytochemical Analysis     Hybrid Journal   (Followers: 2)
Polish Journal of Chemical Technology     Open Access   (Followers: 1)
Reviews in Analytical Chemistry     Hybrid Journal   (Followers: 9)
Sample Preparation     Open Access  
Surface and Interface Analysis     Hybrid Journal   (Followers: 14)
Techniques and Instrumentation in Analytical Chemistry     Full-text available via subscription   (Followers: 5)
TrAC Trends in Analytical Chemistry     Full-text available via subscription   (Followers: 55)
Trends in Environmental Analytical Chemistry     Hybrid Journal   (Followers: 2)
Vibrational Spectroscopy     Hybrid Journal   (Followers: 13)
World Journal of Analytical Chemistry     Open Access   (Followers: 1)
Journal Cover Journal of Analytical Chemistry
  [SJR: 0.268]   [H-I: 23]   [21 followers]  Follow
    
   Hybrid Journal Hybrid journal (It can contain Open Access articles)
   ISSN (Print) 1608-3199 - ISSN (Online) 1061-9348
   Published by Springer-Verlag Homepage  [2335 journals]
  • Methods of nonenzymatic determination of hydrogen peroxide and related
           reactive oxygen species
    • Authors: A. Yu. Olenin
      Pages: 243 - 255
      Abstract: Contemporary nonenzymatic methods for the qualitative and quantitative determination of hydrogen peroxide and reactive oxygen species, preceding to hydrogen peroxide or resulting from it, are reviewed. Many of these procedures can be applied to the detection and determination of reactive oxygen species, for example, anions, peroxide radical anions, hydroxide radicals, etc., in both model and real samples that are of practical importance in biochemistry and medicine. The main direction of development in this area includes the target formation of a surface layer of a sensing element at the nanoscale level, including using nanoparticles. In some cases, higher selectivity can be achieved, and the analytical and performance characteristics of the procedures, such as minimum detectable concentration, analytical range, or sensitivity, can be improved. Most of the cited papers were published after 2010.
      PubDate: 2017-03-01
      DOI: 10.1134/s1061934817030108
      Issue No: Vol. 72, No. 3 (2017)
       
  • Methods of determination of sulfur yperite–DNA adducts
    • Authors: O. I. Orlova; E. I. Savel’eva; G. V. Karakashev
      Pages: 256 - 263
      Abstract: A review of publications on methods for the determination of sulfur yperite adducts with DNA in different biological samples (whole blood, urine, organ and tissue homogenates) is presented. Methods of formation and structures of the most important adducts are considered. Methods of the isolation and hydrolysis of adducts with DNA from biological samples are summarized.
      PubDate: 2017-03-01
      DOI: 10.1134/s1061934817010099
      Issue No: Vol. 72, No. 3 (2017)
       
  • Application of polyaniline–multiwalled carbon nanotubes composite fiber
           for determination of benzaldehyde in injectable pharmaceutical
           formulations by solid-phase microextraction GC–FID using experimental
           design
    • Authors: Vahideh Masoumi; Ali Mohammadi; Mohammad Reza Khoshayand; Mehdi Ansari
      Pages: 264 - 271
      Abstract: A polyaniline–multiwalled carbon nanotubes composite fiber was electrodeposited onto a platinum wire using cyclic voltammetry. This fiber was used for headspace solid-phase microextraction combined with gas chromatography and flame ionization detector of trace levels of benzaldehyde in some injectable pharmaceutical formulations. Three solid-phase microextraction parameters including temperature, time and stirring rate were investigated simultaneously using a three-level-three-factor Box–Behnken as experimental design on the extraction capability. The as-made fiber has a lifetime of over 300 extractions without any obvious decline in extraction efficiency. At the optimum conditions (extraction temperature 60°C, extraction time 15 min, stirring rate 700 rpm), the method displays excellent linearity over the concentration range of 25–1000 ng/mL of benzaldehyde with RSD values ranging from 1.0 to 6.8%. The limits of quantitation and detection were 25 and 10 ng/mL, respectively.
      PubDate: 2017-03-01
      DOI: 10.1134/s1061934817030133
      Issue No: Vol. 72, No. 3 (2017)
       
  • Error of sample preparation in pressing emitters for X-ray fluorescence
           analysis
    • Authors: T. G. Kuz’mina; M. A. Troneva; N. N. Kononkova; T. V. Romashova
      Pages: 272 - 278
      Abstract: When determining element concentrations in geological samples by X-ray fluorescence spectrometry using emitters obtained by pressing tablets from powder samples, we revealed the effect of a significant difference in line intensities of characteristic long-wavelength emission (ΔI i) from opposite sides of the emitter. The effects of compacting pressure, mass of emitter, and its surface area on ΔI i were investigated. It was shown that the account of this effect can reduce the error of sample preparation in using compacting pressures lower than 20 t.
      PubDate: 2017-03-01
      DOI: 10.1134/s1061934817030066
      Issue No: Vol. 72, No. 3 (2017)
       
  • X-ray fluorescence determination of La, Ce, Pr, Nd, and Sm in industrial
           sediments of calcium sulfate using linear regression analysis
    • Authors: D. S. Zinin; N. N. Bushuev; V. V. Kuznetsov
      Pages: 279 - 288
      Abstract: Industrial sediments of calcium sulfate semihydrate obtained from industrial extraction phosphoric acid and containing 0.3–4.5 wt % of impurity La−Sm are investigated by energy-dispersive X-ray fluorescence analysis (XRFA) and a procedure for the quantitative determination of cerium lanthanides in the sediments is developed. The use of linear regression analysis of X-ray fluorescence spectra of multielement industrial samples and models of individual compounds NaLn(SO4)2 · H2O (cp grade) allowed us to resolve overlaps of spectral L-series lines for La–Sm, eliminate the background, and perform the regression assessment of line intensities of these elements. On this basis, we developed a procedure for the determination of La, Ce, Pr, Nd, and Sm in CaSO4 · 0.5H2O sediments with limits of detection (wt %): 0.022, 0.013, 0.011, 0.008, and 0.008, respectively. In concentration ranges (wt %) La (0.05–0.99), Ce (0.1–4.9), Pr (0.005–0.49), Nd (0.02–0.99), and Sm (0.005-0.19), the relative standard deviation RSD (n = 10, P = 0.95) was 18−27, 9−18, 20−31, 17−26, and 19−31%, respectively. A comparison of the results of XRFA with the data of inductively coupled plasma mass spectrometry confirms the accuracy of the results obtained according to OST (Branch Standard) 41-08-221-04.
      PubDate: 2017-03-01
      DOI: 10.1134/s1061934817030157
      Issue No: Vol. 72, No. 3 (2017)
       
  • Assessment of the possibility of the performance of a chromatomembrane
           mass-exchange process on granular composite carbon–fluoroplastic
           sorbents for the generation of standard gas mixtures
    • Authors: O. V. Rodinkov; L. N. Moskvin; A. R. Gorbacheva; A. S. Bugaichenko
      Pages: 289 - 294
      Abstract: A principal possibility of the performance of continuous and discrete versions of a chromatomembrane mass-exchange process (CMP) in a liquid–gas system on granular supports and composite carbon–fluoroplastic sorbents is shown. In contrast to the previously used block (monolithic) composite sorbents, for their granular analogues, an increase in the concentration of sorption-active materials up to 40% of the support weight is possible. It is shown that composite sorbents included in the CMP scheme are most effective for the generation of standard gas mixtures of volatile organic substances.
      PubDate: 2017-03-01
      DOI: 10.1134/s106193481703011x
      Issue No: Vol. 72, No. 3 (2017)
       
  • Headspace gas chromatographic determination of 1,4-dioxane with adsorption
           preconcentration on silica modified with λ-carrageenan
    • Authors: O. I. Fedorchuk; N. G. Kobylinska; V. N. Zaitsev
      Pages: 295 - 302
      Abstract: Organosilica materials containing λ-carrageenan on their surface are synthesized. The conditions for the immobilization of the polysaccharide, such as phase contact time and pH and concentration of solutions, are optimized. It is shown that the chemisorption of the polysaccharide passes through ion exchange multipoint immobilization, which provides a high hydrolytic stability of the prepared organosilica. The rate of washing of λ-carrageenan to the solution does not exceed 0.5%. The physical and chemical characteristics of the new material are studied. In particular, it is shown that the material is completely stable up to 200°C and reversibly desorbs water at 120°C; it well adsorbs 1,4-dioxane from the gas phase and desorbs it under heating to 70°C. This ensures the use of the prepared carrageenan-containing material as an adsorbent for a solid-phase cartridge designed for the adsorption preconcentration of 1,4-dioxane in its headspace gas chromatographic determination in samples of nonionic surfactants. The developed procedure ensures the determination of 1,4-dioxane by gas chromatography with a flame ionization detector in the concentration range 0.012–3.750 mg/L with a limit of detection of 0.0014 mg/L. Preconcentration lowers the limit of detection in the determination of 1,4-dioxane by 50 times.
      PubDate: 2017-03-01
      DOI: 10.1134/s1061934817010063
      Issue No: Vol. 72, No. 3 (2017)
       
  • Optimization of a method for the determination of a mustard gas biomarker
           in human blood plasma by liquid chromatography–high-resolution mass
           spectrometry
    • Authors: A. V. Braun; I. V. Rybal’chenko; M. A. Ponsov; Ya. V. Stavitskaya; L. A. Tikhomirov; A. P. Grechukhin
      Pages: 303 - 308
      Abstract: A method for the determination of a mustard gas biomarker (an S-hydroxyethylthioethyl adduct with albumin) in blood plasma was optimized with the use of HPLC with high-resolution tandem mass-spectrometric detection. This method is based on the hydrolysis of this adduct by the proteinase K enzyme with the formation of the following stable tripeptide with cysteine, proline, and phenylalanine: S-[HETE]-Cys- Pro-Phe. The conditions of the sample preparation of human plasma artificially contaminated by mustard gas (the selection of an aliquot portion volume and an enzyme for the hydrolysis), the mass-spectrometric detection (the selection of optimum pairs of ion reactions and high-resolution detection modes), and the gradient elution program in the HPLC separation of an analyzed mixture were optimized. The detection limit of mustard gas in human blood plasma was 1 ng/mL. The approach proposed was tested in the analysis of human blood plasma samples by the standard addition technique and also within the framework of the first official biomedical test carried out by the Organization for the Prohibition of Chemical Weapons (OPCW) in 2016, and it exhibited a good accuracy, reproducibility, and specificity of determination.
      PubDate: 2017-03-01
      DOI: 10.1134/s1061934817030030
      Issue No: Vol. 72, No. 3 (2017)
       
  • Detection and quantification of chitosan aggregates by pressure-assisted
           capillary zone electrophoresis
    • Authors: T. G. Dzherayan; N. G. Vanifatova; A. A. Burmistrov; E. V. Lazareva; A. V. Rudnev
      Pages: 309 - 315
      Abstract: An approach to the detection and determination of chitosan aggregates in acetic acid solutions is proposed using pressure-assisted capillary zone electrophoresis. Processes of chitosan aggregation are studied depending on the composition of dispersion medium and storage time. The presence of several species of positively charged chitosan aggregates is revealed for the first time. Particle sizes in the range 20–2500 nm are determined by scanning electron microscopy and static and dynamic light scattering. The dependence of the shape of electropherograms on particle size distribution obtained under the same conditions is found. A trend to changing electrophoretic mobility depending on the size of the aggregate is observed, which enables the approximate evaluation of the polydispersity of chitosan solutions. Chitosan is used for the effective dynamic modification of capillaries, which does not require the introduction of a modifier into the background electrolyte.
      PubDate: 2017-03-01
      DOI: 10.1134/s1061934817030042
      Issue No: Vol. 72, No. 3 (2017)
       
  • Zinc oxide nanoparticles-based electrochemical sensor for the detection of
           
    • Authors: Manju Bhargavi Gumpu; Noel Nesakumar; Bhat Lakshmishri Ramachandra; John Bosco Balaguru Rayappan
      Pages: 316 - 326
      Abstract: We report for the first time a cyclic voltammetric nitrate sensor with a low detection limit based on the immobilization of zinc oxide nanoparticles on the surface of the platinum working electrode using chitosan membrane. Cyclic voltammetric data demonstrated that zinc oxide nanoparticles can electrochemically reduce nitrate ions to ammonium ions with high conductivity. In order to estimate electroanalytical parameters for each of the nitrate concentrations, Gaussian and Lorentzian curve fitting algorithms were performed on cyclic voltammetric data. Among them, the best analytical performance results were obtained with Gaussian calibration linear model. The zinc oxide modified platinum electrode showed a linear response to nitrate ions over a concentration range from 0.1 to 2.0 mM with a low detection limit and high sensitivity of 10 nM and 39.91 μA/cm2 mM, respectively. The nitrate ion concentrations in drinking water samples were determined using Gaussian calibration linear model and the predicted, added nitrate ion concentration values showed good correlation.
      PubDate: 2017-03-01
      DOI: 10.1134/s1061934817030078
      Issue No: Vol. 72, No. 3 (2017)
       
  • Chemical sensors based on a hydrochemically deposited lead sulfide film
           for the determination of lead in aqueous solutions
    • Authors: I. V. Zarubin; V. F. Markov; L. N. Maskaeva; N. V. Zarubina; M. V. Kuznetsov
      Pages: 327 - 332
      Abstract: Chemical sensors for determining lead in aqueous solutions are developed based on hydrochemically deposited lead sulfide (PbS) films; their composition and surface morphology are studied. The sensors are sensitive to lead to 31.5–32.5 mV/pc Pb with the limit of detection of the metal 1.5 × 10–8 M. The role of photoactivation and doping of films in increasing the sensitivity of the film sensor to lead is determined. The studied chemical sensors can be relatively easily regenerated by soaking in distilled water for 10–30 min; they have sufficiently high selectivity to lead in the presence of sodium, nickel, zinc, and cadmium salts in solution.
      PubDate: 2017-03-01
      DOI: 10.1134/s1061934817030145
      Issue No: Vol. 72, No. 3 (2017)
       
  • Electrocatalytic performance of cobalt microparticles film-modified
           platinum disk electrode for amperometric detection of ascorbic acid
    • Authors: Merzak Doulache; Boubakeur Saidat; Mohamed Trari
      Pages: 333 - 341
      Abstract: Deposited cobalt microparticales (Co-MPs) film onto the platinum disk electrode has been successfully used as a new amperometric sensor for the determination of ascorbic acid (AA). AA is detected by surface catalyzed oxidation involving cobalt(III) oxyhydroxides in alkaline solution. The Co-MPs/Pt electrode exhibits a high electrocatalytic activity toward the AA oxidation. The diffusion coefficient of AA (6.09 × 105 cm2/s) and the catalytic rate constant (k cat = 6.27 × 103 M–1s–1) have been determined using electrochemical approaches. The amperometric response of the modified electrode is linear against the AA concentration in the range (0.01‒0.48 mM). The sensor displays the best activity with a high response signal, a good sensitivity of 74.3 μA/mM, a low detection limit of 2.5 μM (signal/noise = 3) and a fast response time (<3 s). Moreover, the reproducibility, selectivity and applicability of this biosensor are satisfactorily evaluated.
      PubDate: 2017-03-01
      DOI: 10.1134/s106193481703008x
      Issue No: Vol. 72, No. 3 (2017)
       
  • Determination of phenolic compounds in medicinal plants from the Lamiaceae
           family
    • Authors: V. V. Milevskaya; Z. A. Temerdashev; T. S. Butyl’skaya; N. V. Kiseleva
      Pages: 342 - 348
      Abstract: A procedure for the determination of Phenolic compounds in extracts from the medicinal plants of the Lamiaceae family—garden sage (Salvia officinalis L.), creeping thyme (Thymus serpyllum L.), wild marjoram (Origanum vulgare L.), and common balm (Melissa officinalis L.)—obtained under different extraction conditions was developed. The identification of the extracted compounds was performed and their qualitative and quantitative composition was established by HPLC with diode array and mass-spectrometric detection with consideration for the obtained characteristics of the standard samples of individual components. The test samples of medicinal herbs contained caffeic acid (0.19–0.62 mg/g) and rosmaric acid (4–23 mg/g); the highest rosmaric acid content (23 mg/g) was found in wild marjoram, and the lowest content (4 mg/g), in creeping thyme. The extracts of wild marjoram contained the greatest amounts of Phenolic compounds; rosmaric acid and luteolin-7-O-β-D-glucuronide were major components, whereas protocatechuic, 3-O-caffeoylquinic, and caffeic acids were minor components.
      PubDate: 2017-03-01
      DOI: 10.1134/s1061934817030091
      Issue No: Vol. 72, No. 3 (2017)
       
  • Determination of gold and palladium in rocks and ores by atomic absorption
           spectrometry using two-stage probe atomization
    • Authors: A. V. Volzhenin; N. I. Petrova; N. S. Medvedev; D. S. Irisov; A. I. Saprykin
      Pages: 156 - 162
      Abstract: The efficiency of two-stage probe atomization for the determination of gold and palladium in geological samples by electrothermal atomic absorption spectrometry is studied. The effects of temperature–time program and the position of the probe in an atomizer on the fractionation of sample components and the magnitude of the analytical signal are studied. It is demonstrated that gold and palladium can be quantitatively determined by atomic absorption spectrometry in rocks and ores, using a two-stage probe atomization with the limits of detection for gold and palladium 0.01 and 0.04 g/t, respectively.
      PubDate: 2017-02-01
      DOI: 10.1134/s1061934817020150
      Issue No: Vol. 72, No. 2 (2017)
       
  • Simultaneous determination of dyes of different classes in aquaculture
           products and spices using HPLC–high-resolution quadrupole time-of-flight
           mass spectrometry
    • Authors: V. G. Amelin; A. I. Korotkov; A. M. Andoralov
      Pages: 183 - 190
      Abstract: A simple method of sample preparation, rapid screening, and determination of dyes—veterinary drugs and illegally used dyes (coloring product counterfeiters)—in spices by HPLC–high-resolution quadrupole time-of-flight mass spectrometry is proposed. Sample preparation involves the extraction of analytes from a solid matrix with acetonitrile containing 0.1% of formic acid, twofold dilution of the extract with deionized water, filtration, and chromatographic separation. The limits of detection were 0.01–0.4 ng/g. The procedure of screening and determination of dyes in foods includes the identification of dyes by an accurate monoisotopic mass of the ion (m/z), retention time (t R), and coincidence of the isotopic distribution (mSigma), and, if dyes are detected, their determination by the standard addition method. The relative standard deviation of the results does not exceed 15%. The duration of the analysis is 1–2 h.
      PubDate: 2017-02-01
      DOI: 10.1134/s1061934817020034
      Issue No: Vol. 72, No. 2 (2017)
       
  • Silver selective electrodes using ionophores functionalized with
           thioether‒amide‒amine
    • Authors: Nidhi Rani Gupta; S. K. Ashok Kumar; Susheel K. Mittal; Prabhpreet Singh; Subodh Kumar
      Pages: 191 - 202
      Abstract: New poly(vinylchloride) (PVC) based liquid membrane sensors are reported containing neutral macrocyclic carrier as potential ionophores for sensing silver ions. Three macrocycles (L1, L2 and L3) possessing two thioether, two amide and one secondary amine unit have been used in new PVC membrane-based sensor. At wide pH range of 4.5 to 8.0, these sensors exhibit linear responses in the concentration range of 1 × 10–4 to 0.1 M and detection limit 6 × 10–5 M for L1 and 1 × 10–4 M for L2 and L3 respectively with pseudo-Nernstian slopes between 43‒46 mV/decade for all the three sensors. These sensors have short response time (<15 s) and long life time as these sensors do not show any considerable divergence in their performance over a period of four months. These sensors exhibit good selectivity for Ag+ over wide variety of interfering ions like alkali, alkaline earth, transition and some heavy metal ions. These proposed sensors could be used successfully as indicator electrodes in the potentiometric determination of Ag+ ions and also to determine anions like Cl–, Br–, I–, S2–, SCN– and CN–. Potentiometric titrations for halide ions in a mixture using these sensors and new titration method for the determination of detection limits are reported.
      PubDate: 2017-02-01
      DOI: 10.1134/s1061934817020083
      Issue No: Vol. 72, No. 2 (2017)
       
  • Calibration curve equation in local voltammetry of heterogeneous alloys
    • Authors: E. Yu. Moshchenskaya; V. V. Slepushkin; Yu. V. Rublinetskaya; B. I. Kashkarov
      Pages: 203 - 205
      Abstract: A new calibration curve equation containing no empirical constants is proposed for calculating the concentration dependence of partial current in local voltammetry of heterogeneous alloys. A good agreement between the calculated and experimental data is found on an example of eutectic alloys Cd−Bi and Sn–Bi.
      PubDate: 2017-02-01
      DOI: 10.1134/s1061934816120078
      Issue No: Vol. 72, No. 2 (2017)
       
  • Cleaning of extracts of cereal crop samples with aluminosilicate in the
           determination of pesticides by gas chromatography with mass-spectrometric
           detection
    • Authors: E. R. Oskotskaya; E. N. Gribanov; I. V. Saunina
      Pages: 206 - 212
      Abstract: A procedure for the determination of 23 pesticides from different classes (organophosphorus and organochlorine compounds, synthetic pyrethroids, and triazoles) in cereal crops is proposed. It is based on sample preparation according to the QuEChERS method with the subsequent cleaning of the extract with natural aluminosilicate and the determination of analytes by gas chromatography with mass-spectrometric detection. The limits of the quantitative determination of pesticides are ~0.005 mg/kg. The relative standard deviation does not exceed 0.02. The duration of analysis is 35–40 min.
      PubDate: 2017-02-01
      DOI: 10.1134/s1061934817020101
      Issue No: Vol. 72, No. 2 (2017)
       
  • Identification of traces of oil contamination of biogenic sediments by
           solid-phase extraction combined with thin layer chromatography
    • Authors: M. G. Kul’kov; D. S. Vorob’ev
      Pages: 217 - 225
      Abstract: The possibility of identifying industry-related traces of oil contamination in biogenic sediments is investigated on an example of model oil-contaminated peat samples. It is shown that oil pollution of <1 wt % in biogenic samples cannot be identified using a conventional IR spectrometric procedure. An additional study of organic extracts, isolated in sample preparation, by solid-phase extraction and thin layer chromatography can detect specific oil aromatic hydrocarbons in contaminated samples uncharacteristic for background samples of the same type.
      PubDate: 2017-02-01
      DOI: 10.1134/s1061934817020071
      Issue No: Vol. 72, No. 2 (2017)
       
  • A simple homemade spectrophotometer
    • Authors: Sara Taha; Gelan Rafat; Fatma Aboshosha; Fotouh R. Mansour
      Pages: 239 - 242
      Abstract: A simple portable spectrophotometer was constructed and used to perform analytical experiments. The developed model uses available tools and materials such as light emitting diode lamps, compact discs, plastic and cardboard boxes and a cell phone camera to build a design that illustrates the major components of spectrophotometers. The spectra of serial concentrations of KMnO4 (50‒600 μM) were recorded and the values of absorbance were extracted at λmax to build the calibration curve. A linear relationship between the concentration and absorbance was obtained with the coefficient of determination 0.994. The model was also utilized to study the spectra of KMnO4, phenolphthalein and bromothymol blue in comparison with a Shimadzu UV-1800 spectrophotometer as a reference instrument. In spite of the differences in the observed spectra, the recorded λmax were almost identical to those measured by the developed model. The model was successfully used to determine the concentration of sodium alendronate through ligand-exchange complexation with ferric salicylate.
      PubDate: 2017-02-01
      DOI: 10.1134/s1061934817020113
      Issue No: Vol. 72, No. 2 (2017)
       
 
 
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